VERFAHREN ZUR MESSUNG DER AUSSCHÄLUNG VON SCHÜTZENDEN OBERFLÄCHEN

摘要

PCT No. PCT/EP94/02302 Sec. 371 Date Jan. 11, 1996 Sec. 102(e) Date Jan. 11, 1996 PCT Filed Jul. 12, 1994 PCT Pub. No. WO95/02811 PCT Pub. Date Jan. 26, 1995The present invention relates to a method and apparatus for quantitative determination of the level of spalling of a protective surface coating as a result of repetitive heating and cooling. The method comprises introducing at least one radionuclide into the protective coating of an article, alternately heating and cooling the article for a predetermined number of heating and cooling cycles, collecting the spalled particles and measuring the radioactivity thereof. The apparatus comprises a chamber for receiving the coated article, means for heating the chamber or the article and a spall collector. The spall collector is characterized in having means for immobilizing any spalled coating particles and in being so adapted that the level of radioactivity of any spalled particles can be measured by a gamma -spectrometer.